Relevant bibliographies by topics / Lichene

Academic literature on the topic 'Lichene'

Author: Grafiati
Published: 11 March 2023

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Journal articles on the topic "Lichene"

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Cieślik, Stanisław, and Zygmunt Tobolewski. "The lichenized Ascamycetina of north-eastern Poland." Acta Mycologica 25, no. 1 (August 20, 2014): 57–100. http://dx.doi.org/10.5586/am.1989.003.

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Farkas, E. "Notes and Schedae to Lichenes Delicati Exsiccati Editae in Memoriam Antonín Vězda (1920–2008), Fasc. 6." Acta Botanica Hungarica 63, no. 1-2 (April 19, 2021): 51–66. http://dx.doi.org/10.1556/034.63.2021.1-2.4.

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Lichenes Delicati Exsiccati Editae of little, fine, special lichens is edited in honour of Antonín Vězda (1920–2008). The sixth fascicle of the exsiccate is consisted of 20 species of lichens and lichenicolous fungi and distributed to 12 lichen herbaria of the world. Collectors are J. Halda, G. Kantvilas, L. Lőkös, Z. Palice, N. Varga and E. Farkas.
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Farkas, E. "Notes and schedae to lichenes delicati exsiccati editae in memoriam Antonín Vězda (1920–2008), Fasc. 5." Acta Botanica Hungarica 62, no. 1-2 (March 2020): 23–32. http://dx.doi.org/10.1556/034.62.2020.1-2.3.

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Lichenes Delicati Exsiccati Editae of little, fine, special lichens is edited in honour of Antonín Vězda (1920–2008). The fifth fascicle of the exsiccate is consisted of 20 species of lichens and lichenicolous fungi and distributed to 12 lichen herbaria of the world. Collectors are K. Buaruang, D. Kalb, K. Kalb, G. E. Lee, L. Lőkös, A. Mertens, W. Polyiam, T. Pócs, W. Saipunkaew, D. Tang, N. Varga and E. Farkas.
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Sonina, Anzhella V. "Epilithic lichens and their morphological adaptations to the conditions of the White and Barents Seas coast (Russian Arctic)." Czech Polar Reports 2, no. 2 (June 1, 2012): 109–16. http://dx.doi.org/10.5817/cpr2012-2-11.

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The main aim of our work was to investigate the biodiversity of coastal lichens, conditions of lichen cover formation, and study the structural and functional adaptations of Lecanora intricata (Ach.) Ach. and L. polytropa (Ehrh. ex Hoffm.) Rabenh. The investigation was carried out during 2008-2012 on cliffs both along the Murmansk (the Barents Sea) coast and the southern and western shores of the White Sea. For the evaluation of species composition, and ecotopic coenotical features of epilithic lichen growing on cliffs, the geobotanical methods have been used. In addition, the anatomical, morphological and biochemical studies of Lecanora intricata and L. polytropa have been made. 91 species have been included in the total list of lichens on the White Sea coast. On the Murmask coast of the Barents Sea, 36 lichen species had revealed. On the coastal territory, the epilithic lichens inhabit the upper littoral and supralittoral zone. The lichen cover is formed by two interacting factors: the water factor (sea) and the terrestrial vegetation. Four lichen zones were distinguished in the all studying territories. They differed by the lichen species composition and effect of the sea. The first lichen’s zone is the intrazonal structure in the complex coastal lichen cover. In Lecanora polytropa and L. intricata, structural and functional features of lichens for adaptation to unstable coastal conditions were identified. The crustose biomorphs were better adapted to temperature and degree of hydration of thalli. Formation of the smallest ascospores is reproductive strategy of epilithic lichens in extreme habitats. High content of usnic acid in the studied lichen thalli allows them to exist in the open areas exposed to solar radiation and provides the biotic regulation that affects the structure of lichen cover. Optimal ratio of algal to fungal components in the thalli of these species is necessary to maintain their life in extreme environments.
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Gordon, Catriona A., Rafael Herrera, and Tom C. Hutchinson. "The use of a common epiphytic lichen as a bioindicator of atmospheric inputs to two Venezuelan cloud forests." Journal of Tropical Ecology 11, no. 1 (February 1995): 1–26. http://dx.doi.org/10.1017/s026646740000835x.

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ABSTRACTThe chemistry of epiphytic lichens was determined in two Venezuelan cloud forests adjacent to the Caracas Valley at Altos de Pipe and El Avila National Park. This is the second component of a two-part study examining the chemistry of fogs and their effects on sensitive biota in these forests. The widespread lichen Parmotrema madagascariaceum was chosen as an indicator of trace metal input. Background lichen collections and transplant experiments were carried out to evaluate spatial trends in atmospheric depositon of trace metals at different altitudes and exposures of the two montane locations. Elevated concentratons of metals including Pb and Zn were seen in lichen tissue and associated bark. Lead levels in lichens reached 190 μg g-1 dry wt. Lichens transplanted from relatively ‘clean’ to more polluted sites showed significant increases of metals, particularly Pb. Increases of up to 6.3 μg Pb g-1 mo-1 after 6 and 10 months were recorded relative to background and in situ lichen material. In contrast, when lichsens were reciprocally transplanted in nylon net bags from less to more exposed sites there was a significant decrease in Pb and Zn concentrations after 6 and 10 months. With long-term exposure to elevated concentrations of these trace metals epiphytic lichens, as well as other sensitive cloud forest biota, may be at risk of decline.
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KUSMORO, JOKO, IIN SUPARTINAH NOER, MUHAMAD FEISAL JATNIKA, RIRIN EKA PERMATASARI, and RUHYAT PARTASASMITA. "Lichen diversity in geothermal area of Kamojang, Bandung, West Java, Indonesia and its potential for medicines and dyes." Biodiversitas Journal of Biological Diversity 19, no. 6 (October 9, 2018): 2335–43. http://dx.doi.org/10.13057/biodiv/d190643.

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Kusmoro J, Noer IS, Jatnika MF, Permatasari RE, Partasasmita R. 2018. Lichen diversity in geothermal area of Kamojang, Bandung, West Java, Indonesia and its potential for medicines and dyes. Biodiversitas 19: 2335-2343. The study of lichens diversity in Kamojang, West Java was conducted by survey in geothermal field area following the line transect 6 km along to the East, North West and south from the Power House of Geothermal Power Plant. The lichen samples were taken from bark, soil, and stone. Lichen identification was done by morphological, anatomy and chemical analysis. Dyes potency of Parmotrema and Usnea test using ammoniac fermentation was done in Plant Taxonomy Laboratory of Department Biology, Faculty of Mathematics and Natural Sciences, University of Padjadjaran. The survey has successfully collected 133 species of lichens, belong to 62 genera and 17 families. Parmeliaceae was found as dominant groups, consisting of 33 species and other co-dominant groups are Graphidaceae and Lobariaceae with 24 species and 8 species, respectively. Most lichens in Kamojang geothermal area belong to Ascomycetes, only one Basidiomycetes such as Dictyonema sericeum (Sw.) which found at Kawah Manuk (Manuk crater) area. The rare species of lichens such as Usnea longissima Ach, was found at Pine forest in Arboretum 6 km south of Powerhouse of Kamojang geothermal. Chemical analysis and literature study for Lichenic acid contains was done and generally, atranorin, usnic acid, barbatic and lecanoric acid was found in lichens samples. Amoniac fermentation result showed that Parmotrema tinctorum produced brownish red, red and purple, which occurred within 1 week to 5 weeks after fermentation. While Usnea produced variety of brown color, which occurred within 5 days up to 4 weeks after fermentation. Lichen species containing some medical properties are Bulbothrix, Cladonia and Usnea. While lichens having dyes properties are Hypogymnia, Lobaria, Peltigera, Usnea, and Parmotrema.
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Noer, Iin Supartinah, Joko Kusmoro, Erwan Yudiar Darussalam, Dwi Nur Laksono, and Aan Abdul Hakim. "THE LICHENS DIVERSITY IN TRIANGULATION OF ALAS PURWO NATIONAL PARK, EAST JAVA." KnE Life Sciences 2, no. 1 (September 20, 2015): 265. http://dx.doi.org/10.18502/kls.v2i1.154.

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<p>The lichen flora of tropical areas is still much underworked Java in general and Alas Purwo in East Java for specially is no exception. Alas Purwo National Park is representative of a typical lowland tropical rain forest ecosystem in Java. . It is famous with peculiar and endemic species of plant include sawo kecik (Manilkara kauki) and manggong bamboo (Gigantochloa manggong). , beside among the other plants also ketapang (Terminalia cattapa), nyamplung (Calophyllum inophyllum), kepuh (Sterculia foetida), and keben (Barringtonia asiatica). Moreover, in lowland tropical rain forest ecosystem have reported the lichens species diversity is very high and may include over 200 species in 1 ha. There is no reported have found concerning the lichens richness in Alas Purwo. Recently preliminary study of Lichens diversity have been done at triangulation Zone Alas Purwo National Park , East Java. The lichens of the study area have not been treated comprehensively. We explored the lichenological characteristics of putative”tropical lowland cloud forest” (LCF) in a lowland area (0–20ma.s.l.) near Triangulation using macrolichens (cortocoulous species) as indicator taxa We analyzed lichen diversity on 20 trees in two 0,25 ha plots. In tropical lowland forests, corticolous green algal lichens are abundant and highly diverse. This may be related to adaptation to prevailing microenvironmental conditions including, for example, high precipitation and low light intensities. In the understory of a tropical lowland rain forest in Alas Purwo , we studied the morphology and anatomy of corticolous lichens and microcristal test. We found that from Tetrasigma sp , Serbella otodans, Hemandia feltata Baringtonia aciatika Pandanaceae Manilcara cauci Swetinia mahagoni trees there are 30 species of lichens, dominated by Dyorigma sp Graphis and Glyphis from familia of Graphidaceae and Dirinaria Physcia Pyxine Ramalina from familia of Parmeliaceae. The thallus calour was variety from Green-grey, Green-bllue, green, light green, grey, brown, dark green to orange. They have vegetative as wel as generative reproduction such as isidia, soralia, soredia, chypellae, histerothecia, perithecia,and apothecia. The lichenic acids contain such as gyrophoric acid, barbatic acid, usnic acid, atranorin, acid, divaricatic acid and lecanoric acid, </p><p><strong>Keywords</strong>: Alas Purwo, lichens and lichenic acid.</p>
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Petrzik, Karel, Igor Koloniuk, Hana Sehadová, and Tatiana Sarkisova. "Chrysoviruses Inhabited Symbiotic Fungi of Lichens." Viruses 11, no. 12 (December 3, 2019): 1120. http://dx.doi.org/10.3390/v11121120.

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A lichen body is formed most often from green alga cells trapped in a net of ascomycetous fungi and accompanied by endolichenic or parasitic fungi, other algae, and symbiotic or free-living bacteria. The lichen’s microcosmos is inhabited by mites, insects, and other animals for which the lichen is a source of food or a place to live. Novel, four-segmented dsRNA viruses were detected in saxicolous Chrysothrix chlorina and Lepraria incana lichens. Comparison of encoded genome proteins revealed classification of the viruses to the genus Alphachrysovirus and a relationship to chrysoviruses from filamentous ascomycetous fungi. We propose the names Chrysothrix chrysovirus 1 (CcCV1) and Lepraria chrysovirus 1 (LiCV1) as acronyms for these viruses. Surprisingly, observation of Chrysothrix chlorina hybridization with fluorescent-labelled virus probe by confocal microscope revealed that the CcCV1 virus is not present in the lichen body-forming fungus but in accompanying endolichenic Penicillium citreosulfuratum fungus. These are the first descriptions of mycoviruses from a lichen environment.
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Thakur, Monika, SP Pourush Shrikhandia, and Vinod Kumar. "A Lichens-Mediated Mechanism for Environmental Biodeterioration." Air, Soil and Water Research 15 (January 2022): 117862212211310. http://dx.doi.org/10.1177/11786221221131004.

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As mediators in soil formation, lichens play an essential role in the physical and biological formation of the natural environment. A recent study showed that they are capable of biodegrading stone substrates in a little amount of time, despite being excluded in a geological setting. Many species, mainly those able to produce an oxalate at the thallus-substratum interface, can alter the surface, affecting it chemically. The oxalate remains a noticeable increase even after the lichen has faded, and it makes a major contribution to the structure and composition of the thallus itself. These severe oxalate deposits on historical sites have been alternatively attributed to the earlier as the consequence of air pollutants, prior mechanical/chemical renovation treatments, as well as environmental deterioration. Lichen growth on building materials and biodegradation are frequently based on environmental variables. The biogeophysical and biogeochemical weathering of the substrate by the lichens is the mechanism underlying biodegradation. For stone surfaces, lichens can endeavor bio protection by acting as a barrier against weathering, holding humidity, improving permeability, reducing heat stress and erosion, and absorbing contaminants. Lichen’s significance as a biodeteriorant, its colonization and impact on monuments, as well as bioprotection, are all discussed in the current review.
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Lawrey, James D. "The chemical ecology of lichen mycoparasites: a review." Canadian Journal of Botany 73, S1 (December 31, 1995): 603–8. http://dx.doi.org/10.1139/b95-301.

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Lichenicolous fungi colonize lichens to form a variety of biotrophic associations, and while some 300 genera and 1000 species have been recognized, almost nothing is known about their biology. The lichenicolous habit is an unusual one because lichens produce a variety of antibiotic secondary metabolites that are assumed to protect them from parasitic attack. This may explain why lichens are rarely parasitized in nature while nonlichen-forming Ascomycetes are frequently and extensively parasitized. Recent field and laboratory studies of lichen parasites from a number of fungal groups indicate that chemistry is indeed involved in these interactions. These results indicate that (i) lichenicolous taxa are better able to degrade lichens than related nonlichenicolous taxa, (ii) lichen parasites are generally tolerant of lichen secondary metabolites, (iii) this tolerance seems to be based in part on the ability of cell wall degrading enzymes of parasites to remain active in the presence of these lichen secondary metabolites, and (iv) the host preferences of some lichen parasites reflect these tolerances. Therefore, it appears likely that lichenicolous fungi, which have presumably had lengthy coevolutionary histories with lichens, have evolved a unique mode of nutrition that is based in part on an ability to tolerate lichen defense compounds. Key words: Hobsonia, lichens, lichenicolous fungi, Nectria, parasites.
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Dissertations / Theses on the topic "Lichene"

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Johansson, Per. "Effects of habitat conditions and disturbance on lichen diversity : studies on lichen communities in nemoral, boreal and grassland ecosystems /." Uppsala : Dept. of Conservation Biology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200606.pdf.

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Candotto, Carniel Fabio. "Meccanismi di risposta di simbionti lichenici allo stress foto-ossidativo." Doctoral thesis, Università degli studi di Trieste, 2014. http://hdl.handle.net/10077/10139.

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2012/2013
I licheni, una simbiosi mutualistica tra un fungo (il micobionte), generalmente un ascomicete, e una o più popolazioni di alghe e/o cianobatteri (il fotobionte) sono considerati forme di vita estremofile in quanto da disidratati possono resistere a condizioni ambientali molto difficili come elevati irraggiamenti solari, scarsa disponibilità d'acqua e di nutrienti e dosi elevate di inquinanti aerodiffusi. Tali fattori di stress tuttavia inducono una sovrapproduzione a livello cellulare di specie reattive dell'ossigeno (ROS), che se eccede le difese antiossidanti genera stress ossidativo. L'accumulo delle ROS è un fenomeno molto pericoloso perché porta al danneggiamento di importanti macromolecole come lipidi, proteine e DNA ed in casi estremi può condurre anche alla morte cellulare. Sebbene gli effetti dello stress foto-ossidativo nei licheni siano già stati studiati, in questo dottorato di ricerca si è voluto approfondire alcuni aspetti ancora poco chiari relativi alla resistenza dei fotobionti a questo stress e alla resistenza dei licheni allo stress ossidativo indotto dalla presenza di elevate concentrazioni di inquinanti fotochimici come l'ozono (O3). Sul primo filone di ricerca sono stati condotti due studi. Nel primo ci si è focalizzati sugli effetti dello stress foto-ossidativo su parametri fisiologici di vitalità (ChlaF) e di produzione di ROS in un fotobionte lichenico e nella sua controparte lichenizzata. Ciò è stato ottenuto sottoponendo colture axeniche del fotobionte Trebouxia sp. e lobi del lichene Parmotrema perlatum da cui è stato isolato il fotobionte, a diverse combinazioni di umidità relativa e intensità luminose per periodi di tempo crescenti. L'obiettivo di questo studio è stato quello di approfondire le conoscenze sui benefici indotti dalla lichenizzazione nella resistenza al disseccamento e al concomitante stress foto-ossidativo. Il secondo studio invece, strettamente connesso al primo, è focalizzato sulla variazione di espressione genica dell'intero trascrittoma del fotobionte Trebouxia gelatinosa, isolato dal lichene Flavoparmelia caperata (L.) Hale, indotta da eventi di disidratazione e reidratazione. Con questo studio si è voluto individuare ed analizzare i meccanismi molecolari alla base della tolleranza di questo organismo al disseccamento e al concomitante stress fotoossidativo. Sul secondo filone di ricerca invece è stato condotto uno studio sulle risposte fisiologiche, citologiche e biochimiche del lichene Flavoparmelia caperata (L.) Hale sottoposto a fumigazioni con O3 e mantenuto a diversi regimi di idratazione e di umidità relativa ambientale. L'obiettivo di questo studio è stato quello di verificare se la tolleranza di questo lichene allo stress ossidativo derivante dall'esposizione all'O3 dipende da una strategia O3-avoidant, imputabile alla sua inattività metabolica durante le ore della giornata in cui si verifica il picco dell'O3, oppure da una O3-tolerant, dovuta invece alla presenza di un cospicuo ed efficace corredo di difese antiossidanti. Il primo studio ha dimostrato che il fotobionte algale al di fuori della simbiosi è in grado di resistere a livelli elevati di stress foto-ossidativo anche per periodi molto lunghi. Tuttavia è stato confermato che la simbiosi adduce benefici importanti come l'aumento della capacità di estinzione dell'energia accumulata dalle clorofille attraverso meccanismi non fotochimici e un ridotto effetto ossidativo indotto dal disseccamento. Questi risultati ci hanno permesso di sfatare l'ormai consolidata idea che i fotobionti algali, in particolare quelli del genere Trebouxia, siano particolarmente delicati e incapaci di tollerare autonomamente (al di fuori della simbiosi) fattori di stress abiotici come quelli che intervengono durante il disseccamento. Dai risultati del secondo studio è emerso che il fotobionte T. gelatinosa per far fronte alle importanti alterazioni dovute alla perdita d'acqua, si affida soprattutto a meccanismi che intervengono durante la fase di reidratazione. I più importanti coinvolgono molecole di riparazione “chaperone”, e. g. “Heath Shock Proteins”, e proteine della famiglia “Desiccation Related Proteins”, la cui funzione è ancora sconosciuta, ma visto l'elevato numero, la loro diversità intraspecifica e la sensibilità ai cambi di contenuto idrico, sembrano giocare un ruolo molto importante. Paradossalmente invece non sono state osservate alterazioni nell'espressione di geni collegati alle difese antiossidanti, che è sempre rimasta a livelli costitutivi. Ciò è stato interpretato come una strategia che permette all'organismo di avere sempre a disposizione mRNA per la neo-sintesi di nuovi enzimi coinvolti nelle difese antiossidanti. Infine nell'ultimo studio è stata riconfermata l'elevata resistenza del lichene F. caperata allo stress ossidativo derivato dall'esposizione all'O3 in quanto alla concentrazione utilizzata, ovvero il massimo registrato nell'ambiente alle nostre latitudini, non è stato osservato alcun effetto sulla vitalità nonostante sia stata osservata una notevole produzione di ROS. L'effetto ossidativo dell'O3 infatti è stato controbilanciato dalle difese antiossidanti le quali si sono mostrate altamente sensibili all'esposizione ed efficaci anche a bassi contenuti idrici. Lo stress ossidativo derivante da fattori abiotici di origine naturali e antropica dunque sembra essere gestito efficacemente sia dai licheni che dai loro fotobionti isolati, grazie ad efficienti difese antiossidanti e all'intervento di meccanismi di riparazione del danno.
XXVI Ciclo
1983
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Denoeud-Valdeyron, Marie-Laure. "Les lichens, bioindicateurs de pollution atmospherique : application aux alentours de l'usine roquette a lestrem." Lille 2, 1992. http://www.theses.fr/1992LIL2P020.

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MATHEY, ANNICK. "De in situ lichenum investigatione de l'analyse in situ des lichens." Paris 6, 1987. http://www.theses.fr/1987PA066744.

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Le but de l'etude est de montrer, a partir d'exemples qu'il est possible de reunir des informations sur une plante (morphologie, anatomie, chimie et ecologie) sans creation d'artefact et de remplacer des donnees subjectives par des donnees mesurables, c'est-a-dire reproductibles. Les lichens constituent un modele biologique
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Chu, Fung Joanna. "Ecology of supralittoral lichens on Hong Kong rocky shores /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18735526.

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Nguyen, Thi Thu Tram. "Screening of mycosporine-like compounds in the dermatocarpon genus : phytochemical study of the lichen dermatocarpon luridum (WITH.) J.R Laundon." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S177/document.

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Un criblage phytochimique à partir de quatre lichens saxicoles hydrophiles du genre Dermatocarpon a mis en évidence la présence inattendue de composés de type mycosporines dans ces chlorolichens. Leur présence a été confirmée dans des échantillons historiques d'herbiers couvrant une période de plus de 170 ans. Leur teneur était comprise entre 0,1 et 1,4 mg/g de lichen sec. Trois mycosporines ont été isolées de Dermatocarpon luridum collecté en Bretagne sur des rochers d'eau vive: deux mycosporines natives, la mycosporine glutaminol et la mycosporine glutamicol ainsi qu'un artéfact d'isolement, l'ester éthylique de la mycosporine glutamicol. Leurs propriétés physico-chimiques incluant le calcul de leur pKa ont été déterminées. L'étude phytochimique a également conduit à l'isolement de sept autres composés dont un acide aminé non protéique, un dipeptide et un céramide identifiés pour la première fois dans un lichen et le cérévistérol jusqu'ici non décrit dans D. luridum. Les activités cytotoxiques et photoprotectrives des composés disponibles en quantité suffisante ont été évaluées. Le cérévistérol a montré une cytotoxicité modérée sur huit lignées cellulaires contrairement aux cinq autres composés. Les propriétés photoprotectrices et activités antioxydantes de l'ester éthylique de la mycosporine glutamicol et d'un extrait aqueux semi-purifié de D. miniatum présentent un intérêt pour un possible développement comme actif solaire
A screening of mycosporine-like compounds in four hydrophilic Dermatocarpon lichen species has highlighted the unexpected occurrence of such metabolites in chlorolichens. These compounds were confirmed and quantified in historical herbarium samples (15-50 mg) even more than 170 years old. Total mycosporine contents ranged from 0.1 to 1.4 mg/g of dry lichens. Two genuine mycosporines (mycosporine glutaminol and the more stable mycosporine glutamicol) with an artifact mycosporine glutamicol ethyl ester were isolated from Dermatocarpon luridum collected in a breton river. Their physico-chemical properties were also determined including pKa. The phytochemical studies led to the isolation of seven additional compounds in which a non-protein amino acid, a dipeptide and a ceramide were identified for the first time in lichens and cerevisterol for the first time in D. luridum. Compounds obtained in suitable quantity were evaluated for their cytotoxic and photoprotective properties. Except a moderate cytotoxicity of cerevisterol, the five tested compounds were not found toxic on the eight cell lines. Photoprotective properties of the mycosporine glutamicol ethyl ester and a semi-purified aqueous extract of Dermatocarpon miniatum along with some antioxidant activities are promising to develop new sunscreens
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Cooper, Susan Mary. "Genital lichen planus." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432941.

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Caldiz, Mayra S. "Diversity and growth of epiphytic macrolichens in northwestern Patagonian Nothofagus forests /." Alnarp : Swedish University of Agricultural Sciences, 2005. http://diss-epsilon.slu.se/archive/00000831/.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2005.
Thesis documentation sheet inserted. Appendix reproduces four papers and manuscripts, three co-authored with others. Includes bibliographical references. Also partially available electronically via World Wide Web in PDF format; online version lacks appendix.
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Högnabba, Filip. "Phylogenetic studies of cyanobacterial lichens /." Helsinki : Yliopistopaino, 2007. http://ethesis.helsinki.fi.

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Roullier, Catherine. "Recherche de mycosporines et de dérivés aminés lichéniques d’intérêt pour les cancers photoinduits : étude phytochimique d’un lichen marin : Lichina pygmaea (Lightf.) C. Agardh." Rennes 1, 2010. http://www.theses.fr/2010REN1S085.

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Suite à l’augmentation croissante des cancers de la peau, la recherche de nouvelles solutions thérapeutiques (et préventives) est nécessaire. Les lichens sont une source prometteuse de métabolites secondaires. Dans un premier temps, un criblage de différents lichens à cyanobactéries a permis de mettre en évidence la présence de composés de type mycosporine dans plusieurs d’entre elles et notamment d’une structure nouvellement décrite. La mycosporine sérinol a pu ensuite être isolée en quantité à partir d’un lichen marin Lichina pygmaea. Son étude phytochimique plus poussée a conduit à l’isolement de nouveaux dérivés aminés, comme la pygméine dont l’accès à des analogues de synthèse a permis de confirmer son identification. La plupart des composés obtenus en quantité suffisante ont été évalués pour leurs capacités photoprotectrice et à visée anticancéreuse. Quelques composés ont montré une activité intéressante et pourraient être de bons candidats dans la protection des cancers photoinduits
As cutaneous cancers are increasing, research of new therapeutic solutions is necessary and the lichens are a promising source of secondary metabolites. Initially, a screening of various lichens containing cyanobacteria has highlighted the presence of mycosporine-like compounds in several of them, including a newly described structure. Then, mycosporine serinol has been isolated quantitatively from a marine lichen Lichina pygmaea. Further phytochemical studies led to the isolation of new amino derivatives, like pygmeine which has been synthetized along with analogues. Most of the compounds obtained in suitable quantity were evaluated for their photoprotective properties and in anti-cancer targeted tests. Some compounds showed interesting activity and could be good candidates in the protection of photoinduced skin cancers
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Books on the topic "Lichene"

1

Woods, R. G. A conservation evaluation of British lichens. London: British Lichen Society, 2003.

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Orange, Alan. Microchemical methods for the identification of Lichens. London: British Lichen Society, 2001.

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Flora of New Zealand: Lichens : including lichen-forming and lichenicolous fungi. 2nd ed. Lincoln, N.Z: Manaaki Whenua Press, 2007.

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Huneck, Siegfried. Identification of lichen substances. Berlin: Springer, 1996.

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Huneck, S. Identification of lichen substances. Berlin: Springer, 1996.

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Paul, Rogers, Rosentreter Roger 1951-, and Rocky Mountain Research Station (Fort Collins, Colo.), eds. Lichen communities indicator results from Idaho: Baseline sampling. [Fort Collins, CO]: U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, 2003.

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author, Clerc Philippe 1955, Habashi Christine author, Mermilliod Jean-Claude author, and Conservatoire et jardin botaniques de la ville de Genève, eds. Liste rouge des lichens du canton de Genève. Ville de Genève: Conservatoire et jardin botaniques de la Ville de Genève, 2015.

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Taxonomical revision of the Caloplaca saxicola group (Teloschistaceae, lichen-forming Ascomycota): With 2 figures, 11 tables and 37 plates. Berlin: Cramer in der Gebrüder Borntraeger Verlagsbuchhandlung, 2009.

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Nimis, Pier Luigi, Christoph Scheidegger, and Patricia A. Wolseley, eds. Monitoring with Lichens — Monitoring Lichens. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0423-7.

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L, Nimis P., Scheidegger Christoph, and Wolseley P. A, eds. Monitoring with lichens: Monitoring lichens. Dordrecht: Kluwer Academic, 2002.

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Book chapters on the topic "Lichene"

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 1–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_878-2.

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-642-27833-4_878-3.

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 1377–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_878.

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 918–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_878.

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Horst, R. Kenneth. "Lichens." In Westcott's Plant Disease Handbook, 237. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-2141-8_34.

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Fish, J. D., and S. Fish. "Lichenes." In A Student’s Guide to the Seashore, 66–70. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-011-5888-6_5.

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-642-27833-4_878-4.

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Bährle-Rapp, Marina. "Lichen." In Springer Lexikon Kosmetik und Körperpflege, 320. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_5981.

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Nimis, P. L., C. Scheidegger, and P. A. Wolseley. "Monitoring with Lichens — Monitoring Lichens." In Monitoring with Lichens — Monitoring Lichens, 1–4. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0423-7_1.

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Price, Harper N., and Andrea L. Zaenglein. "Lichen Planus and Lichen Nitidus." In Harper's Textbook of Pediatric Dermatology, 85.1–85.17. Oxford, UK: Wiley-Blackwell, 2011. http://dx.doi.org/10.1002/9781444345384.ch85.

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Conference papers on the topic "Lichene"

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Pchelkina, T., Anna Koukhta, and Aleksey Pchelkin. "THE ROLE OF MICROCLIMATIC CONDITIONS IN FORMATION OF LICHENOBIOTA RESPONSE TO ANTHROPOGENIC POLLUTION IN MOSCOW." In Land Degradation and Desertification: Problems of Sustainable Land Management and Adaptation. LLC MAKS Press, 2020. http://dx.doi.org/10.29003/m1704.978-5-317-06490-7/180-185.

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The paper considers the combination of climatic and anthropogenic factors on the lichen flora of the metropolis. The impact level of each factor chaing leads to changes in the status of biota. With the same background level of pollution, the value of the atmosphere purity index is higher under more favorable microclimatic conditions for lichens. Monitoring of influence of one of factors on lichenological indicators should be carried out at invariable value of other factor.
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Cohen, Sophie, William Smisko, Matthew Harrison, Alex Blumenthal, and Jonathan P. Schmitkons. "DETERMINING THE EFFECT OF TREE CANOPY AND LICHEN SPECIES ON SORPTION CAPABILITIES OF LICHENS." In 54th Annual GSA Northeastern Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019ne-328313.

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Popovici, Violeta, Laura Bucur, Verginica Schroder, Aureliana Caraiane, and Victoria Badea. "STUDIES ON THE CYTOTOXIC POTENTIAL OF THE EXTRACT OF USNEA BARBATA (L.) F.H.WIGG." In NORDSCI International Conference. SAIMA Consult Ltd, 2020. http://dx.doi.org/10.32008/nordsci2020/b1/v3/29.

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Usnea barbata (L.) F.H.Wigg. is a fruticose lichen widespread in coniferous forests in the temperate zone of Europe and North America. The special dual structure of lichens, the result of the symbiosis between a fungus and an alga / cyanobacteria and the specific conditions in which they live, determine the synthesis of many special organic compounds - secondary metabolites - which ensure optimal protection against disturbing physical and biological factors. The present study aims to evaluate the cytotoxic activity of the extract of Usnea barbata (L.) F H Wigg. The cytotoxic activity was evaluated on the swimming larvae of Artemia salina L. The results was appreciated by the larvae mortality in contact with solutions of different concentrations of extract in dimethyl sulfoxide, comprised in the range 30 - 266 μg/mL; the highest mortality rate was obtained at 266 μg/mL. In conclusion, the present study shows that the extract of Usnea barbata (L.) F.H.Wigg. has cytotoxic properties; the cytotoxicity is directly proportional to the concentration of the applied extract solution.
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Peveler, Matthew, Tushar Gurjar, Evan Maicus, Andrew Aikens, Alexander Christoforides, and Barbara Cutler. "Lichen." In SIGCSE '19: The 50th ACM Technical Symposium on Computer Science Education. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3287324.3293867.

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Esch, S., A. Hensel, and S. Brandt. "γ-Propoxy-sulfo-lichenin, a semisynthetic polysaccharide of Lichenan shows strong activity in keratinocyte differentiation." In GA 2017 – Book of Abstracts. Georg Thieme Verlag KG, 2017. http://dx.doi.org/10.1055/s-0037-1608054.

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Skirin, F. V. "ВИДОВОЙ СОСТАВ ЛИШАЙНИКОВ И ЭКОЛОГО-СУБСТРАТНЫЕ ОСОБЕННОСТИ КОРЫ КАЛОПАНАКСА СЕМИЛОПАСТНОГО." In GEOGRAFICHESKIE I GEOEKOLOGICHESKIE ISSLEDOVANIIA NA DAL`NEM VOSTOKE. ИП Мироманова Ирина Витальевна, 2019. http://dx.doi.org/10.35735/tig.2019.57.80.011.

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Данная работа направлена на изучение видового состава эпифитных лишайников калопанакса семилопастного (диморфанта) и экологосубстратных особенностей его коры (ритидома). Работы проводились на юге Приморского края: на полуострове МуравьёваАмурского, в окрестностях посёлка Заводской (Артёмовский городской округ), на о. Русский и хребте Барачный (Надеждинский район). Заложено 9 пробных площадей. На калопанаксе были отобраны образцы эпифитных лишайников и коры (ритидома) для определения реакции рН. При выявлении видового состава эпифитных лишайников были использованы как собственные данные автора, так и литературные данные. Видовой состав эпифитных лишайников для калопанакса семилопастного включает 46 видов, 24 из которых, приводятся по литературным данным. Отмечено преобладание в видовом составе диморфанта накипных лишайников, что не характерно для форофитов с подобным типом коры. Исследованы экологосубстратные особенности коры диморфанта для деревьев различного возраста. Структура коры взрослого калопанакса сходна с таковой у дуба монгольского. Также, впервые был определен диапазон рН коры диморфанта. Отмечено сходство значений кислотности коры исследуемого форофита с таковыми для дуба монгольского, липы амурской и многих других деревьев. Отмечается, что видовое богатство и проективное покрытие лишайников на стволах калопанакса заметно ниже, чем у форофитов, имеющих сходные с ним характеристики коры и произрастающих в той же лесной формации. Отчасти это явление обуславливается особенностями коры молодых калопанаксов, отчасти общим снижением видового разнообразия эпифитных лишайников под антропогенным влиянием. Тем не менее, не удаётся выявить факторы, затрудняющие заселение стволов взрослых калопанаксов эпифитами, в условиях экосистем с высоким видовым разнообразием лишайников. Возможно, причина заключается в химическом составе ритидома дерева. В литературе упоминалось о подавлении роста бактерий золотистого стафилококка настоем коры калопанакса, однако сведений о влиянии химических компонентов его коры на лишайники или их отдельные компоненты не выявлено.This paper represents a study of a species composition of lichens that grows on Kalopanax septemlobus and ecosubstrate features of its bark. The area of study covers the south of Primorsky Krai at MuravyovAmursky peninsula near the Zavodskoy town (Artyomovskiy city district), at Russky island and at the Barachniy ridge (Nadezhdinsky district). 9 sample plots were placed. Epiphytic lichens and three bark samples for the pH determination was taken from kalopanax. For the identification of epiphytic lichens species composition both authors own data and literature data were used. Epiphytic lichens composition for the Kalopanax septemlobus includes 46 species, 24 of which are given according to literature data. Predominance of crustose thallus lichens over foliose thallus lichens was observed. This fact shows nontypical situation for the phorophytes with this type of bark. Ecosubstrate features of kalopanax bark were studied for threes of different ages. Bark structure of the mature kalopanax is similar to bark of Quercus mongolica. Also, there was the first time when pH range of kalopanax bark was identified. A similarity was noted between the acidity of the bark of the studied forophyte and those for Mongolian oak, Amur linden and many other trees. We have noted that biodiversity and projective cover of epiphytic lichens on kalopanax trunk is noticeably lower than for ones on the other threes that have similar bark properties and those are growing at the same forest ecosystem. Partly this phenomenon is caused by the peculiarities of the bark of young kalopanaks, partly by a general decrease in the species diversity of epiphytic lichens under anthropogenic influence. Nevertheless, it is not possible to identify factors that impede the colonization of adult kalopanax trunks with epiphytes in ecosystems with a high species diversity of lichens. Perhaps the reason is the chemical composition of tree ritidom. In the literature, it was mentioned that staphylococcus aureus bacteria growth was suppressed by infusion of kalopanax bark, however, no information was found on the effect of the chemical components of its bark on lichens or their separate components.
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Masu, Smaranda. "AIR BIOMONITORING USING LICHENS." In International Symposium "The Environment and the Industry". National Research and Development Institute for Industrial Ecology, 2016. http://dx.doi.org/10.21698/simi.2016.0016.

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Popovici, Violeta, Laura Bucur, Gabriela Vochita, Victoria Badea, and Florin-Ciprian Badea. "CONTRIBUTIONS TO THE COMPLEX STUDY ON ANTITUMOR ACTIVITY OF USNEA BARBATA (L.) F.H.WIGG." In NORDSCI International Conference. SAIMA Consult Ltd, 2020. http://dx.doi.org/10.32008/nordsci2020/b1/v3/25.

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Usnea barbata (L.)F.H.Wigg. - known as “old man’s beard”, “tree moss”, “songluo” is a lichen in the family Parmeliaceae, genus Usnea. Usnea species have recorded history of therapeutic use dating back over three thousand years in Chinese medicine. The lichen secondary metabolites have shown an impressive range of biological proprieties, including antibiotic, antifungal, antiviral, anti-inflammatory, or anticancer activities. In this study, the antitumor activity of Usnea barbata extract was evaluated by observing the morphological changes on squamous cells carcinoma cell-line CAL 27 (ATCC® CRL-2095 ™) in contact with different concentrations of extract, ranged between 12.5–400 μg/mL. The results obtained were quantified by the intensity of morphological changes of the tumor cells after 24 hours of contact. The most significant activity were recorded for 400 μg/mL extract. This study shows that Usnea barbata (L.)F.H.Wigg. extract has antitumor activity. The analysis of the obtained results showed that the cytotoxicity of lichen extract on CAL 27 tumor cells is directly related to the concentration of the applied solution.
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Rassabina, A. E., R. T. Galeev, R. P. Beckett, V. R. Khabibrakhmanova, and F. V. Minibayeva. "Paramagnetic properties of lichen melanins." In MODERN SYNTHETIC METHODOLOGIES FOR CREATING DRUGS AND FUNCTIONAL MATERIALS (MOSM2020): PROCEEDINGS OF THE IV INTERNATIONAL CONFERENCE. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0069483.

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Beckett, R. P. "Safely valves for photosynthesis in lichens." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-25.

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Reports on the topic "Lichene"

1

Hochman, Ayala, Thomas Nash III, and Pamela Padgett. Physiological and Biochemical Characterization of the Effects of Oxidant Air Pollutants, Ozone and Gas-phase Nitric Acid, on Plants and Lichens for their Use as Early Warning Biomonitors of these Air Pollutants. United States Department of Agriculture, January 2011. http://dx.doi.org/10.32747/2011.7697115.bard.

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Introduction. Ozone and related oxidants are regarded as the most important phytotoxic air pollutant in many parts of the western world. A previously unrecognized component of smog, nitric acid, may have even greater deleterious effects on plants either by itself or by augmenting ozone injury. The effects of ozone on plants are well characterized with respect to structural and physiological changes, but very little is known about the biochemical changes in plants and lichens exposed to ozone and/or HNO3. Objectives.To compare and contrast the responses of crop plants and lichens to dry deposition of HNO3 and O3., separately, and combined in order to assess our working hypothesis that lichens respond to air pollution faster than plants. Lichens are most suitable for use as biomonitors because they offer a live-organism-based system that does not require maintenance and can be attached to any site, without the need for man-made technical support systems. Original Immediate aims To expose the tobacco (Nicotiana tabacum L.) cultivar Bel-W3 that is ozone supersensitive and the ozone sensitive red kidney bean (Phaseolusvulgaris) and the lichen Ramalinamenziesii to controlled HNO3 and O3 fumigations and combined and to follow the resulting structural, physiological and biochemical changes, with special reference to reactive oxygen species related parameters. Revised. Due to technical problems and time limitations we studied the lichen Ramalinamenziesii and two cultivar of tobacco: Bel-W3 that is ozone supersensitive and a resistant cultivar, which were exposed to HNO3 and O3 alone (not combined). Methodology. Plants and lichens were exposed in fumigation experiments to HNO3 and O3, in constantly stirred tank reactors and the resulting structural, physiological and biochemical changes were analyzed. Results. Lichens. Exposure of Ramalinamenziesiito HNO3 resulted in cell membrane damage that was evident by 14 days and continues to worsen by 28 days. Chlorophyll, photosynthesis and respiration all declined significantly in HNO3 treatments, with the toxic effects increasing with dosage. In contrast, O3 fumigations of R. menziesii showed no significant negative effects with no differences in the above response variables between high, moderate and low levels of fumigations. There was a gradual decrease in catalase activity with increased levels of HNO3. The activity of glutathione reductase dropped to 20% in thalli exposed to low HNO3 but increased with its increase. Glucose 6-phosphate dehydrogenase activity increase by 20% with low levels of the pollutants but decreased with its increase. Tobacco. After 3 weeks of exposure of the sensitive tobacco cultivar to ozone there were visible symptoms of toxicity, but no danmage was evident in the tolerant cultivar. Neither cultivar showed any visible symptoms after exposure to HNO3.In tobacco fumigated with O3, there was a significant decrease in maximum photosynthetic CO2 assimilation and stomatal conductance at high levels of the pollutant, while changes in mesophyll conductance were not significant. However, under HNO3 fumigation there was a significant increase in mesophyll conductance at low and high HNO3 levels while changes in maximum photosynthetic CO2 assimilation and stomatal conductance were not significant. We could not detect any activity of the antioxidant enzymes in the fumigated tobacco leaves. This is in spite of the fact that we were able to assay the enzymes in tobacco leaves grown in Israel. Conclusions. This project generated novel data, and potentially applicable to agriculture, on the differential response of lichens and tobacco to HNO3 and O3 pollutants. However, due to experimental problems and time limitation discussed in the body of the report, our data do not justify yet application for a full, 4-year grant. We hope that in the future we shall conduct more experiments related to our objectives, which will serve as a basis for a larger scale project to explore the possibility of using lichens and/or plants for biomonitoring of ozone and nitric acid air pollution.
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Daniele Armaleo, Daniele Armaleo. How do lichens withstand desiccation? Experiment, December 2018. http://dx.doi.org/10.18258/12505.

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Battista Di Pierro, Giovanni, and Enzo Palminteri. Management of penile lichen sclerosus. BJUI Knowledge, October 2019. http://dx.doi.org/10.18591/bjuik.0709.

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Stolte, K., D. Mangis, R. Doty, K. Tonnessen, and Laurie S. Huckaby. Lichens as bioindicators of air quality. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1993. http://dx.doi.org/10.2737/rm-gtr-224.

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Stolte, K., D. Mangis, R. Doty, K. Tonnessen, and Laurie S. Huckaby. Lichens as bioindicators of air quality. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1993. http://dx.doi.org/10.2737/rm-gtr-224.

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Smith, I. R. Surficial geology, Lichen Creek, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2009. http://dx.doi.org/10.4095/247303.

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Mercado-Díaz, Joel A., William A. Gould, Grizelle Gonzalez, and Robert Lücking. Lichens in Puerto Rico: an ecosystem approach. San Juan, PR: U.S. Department of Agriculture, Forest Service, International Institute of Tropical Forestry, 2015. http://dx.doi.org/10.2737/iitf-gtr-46.

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Spirito, Francesca, Lorenzo Lo Muzio, and Mario Dioguardi. Oral lichen planus in children: systematic review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, September 2022. http://dx.doi.org/10.37766/inplasy2022.9.0106.

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Neitlich, Peter, Paul Rogers, and Roger Rosentreter. Lichen communities indicator results from Idaho: baseline sampling. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 2003. http://dx.doi.org/10.2737/rmrs-gtr-103.

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Samuel Hargrove, Samuel Hargrove. What environmental factors control lichen form throughout the redwood canopy? Experiment, March 2015. http://dx.doi.org/10.18258/4834.

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